|
| year | production | consumption |
| 1980 | 3,426.00 | 2,633.50 |
| 1981 | 3,403.00 | 2,591.77 |
| 1982 | 3,260.00 | 2,539.50 |
| 1983 | 3,252.00 | 2,406.78 |
| 1984 | 3,420.00 | 2,438.90 |
| 1985 | 3,404.00 | 2,434.97 |
| 1986 | 3,618.00 | 2,665.95 |
| 1987 | 3,518.00 | 2,746.73 |
| 1988 | 3,770.40 | 2,812.63 |
| 1989 | 3,817.00 | 2,783.55 |
| 1990 | 4,148.90 | 2,927.31 |
| 1991 | 4,364.40 | 2,977.41 |
| 1992 | 4,456.41 | 3,106.93 |
| 1993 | 4,649.15 | 3,233.65 |
| 1994 | 4,887.46 | 3,371.31 |
| 1995 | 5,305.87 | 3,528.08 |
| 1996 | 5,674.28 | 3,730.14 |
| 1997 | 6,150.55 | 3,902.47 |
| 1998 | 6,248.47 | 4,018.28 |
| 1999 | 6,104.50 | 4,087.07 |
| 2000 | 6,412.91 | 4,125.40 |
| 2001 | 6,288.81 | 4,156.84 |
| 2002 | 5,962.78 | 4,073.76 |
| 2003 | 5,692.84 | 3,999.25 |
| 2004 | 5,967.10 | 4,135.55 |
| 2005 | 6,100.26 | 4,280.04 |
| 2006 | 6,137.51 | 4,511.44 |
| 2007 | 6,101.68 | 4,773.23 |
| 2008 | 6,164.93 | 4,864.02 |
| 2009 | 6,201.76 | 4,934.63 |
| 2010 | 6,295.49 | 5,140.89 |
| 2011 | 6,526.25 | 5,606.72 |
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